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    <title>Dad Jokes 一点都不好笑的笑话</title>
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    <div class="container">
        <h3>不好笑挑战</h3>
        <div class="joke" id="joke">// 准备好开始了吗</div>
        <button class="btn" id="jokeBtn">换一个更不好笑的</button>
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